David, What does WBT mean?
WBT is a German company that makes connectors for electronics and is known to us for their Speaker Binding Posts, speaker cable connectors, etc. They make other audiophile connectors as well.
"WBT-Industrie GmbH
Industry sector: Mechanical engineering - Precision engineering
Main focus: Electromechanical connectors designed for the entertainment electronics, high-tech medical equipment and measurement technology"